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(Click for frequent words.) 71 meteoroid 70 impactors 70 ejecta 68 asteroids 68 comet 68 micrometeoroids 67 comets 65 comets asteroids 64 Cosmic rays 64 galactic cosmic rays 64 icy moons 64 cometary debris 63 magnetosphere 63 coronal mass ejections CMEs 63 asteroid 63 comet nucleus 63 planetesimals 63 asteroids comets 63 meteor 62 icy comets 62 meteors 62 cosmic rays 62 meteorites 62 sunlike stars 61 martian atmosphere 61 coronal mass ejection 61 cosmic ray 61 protoplanets 61 KBOs 61 phyllosilicates 61 energetic electrons 61 airbursts 61 moon Io 61 Epsilon Eridani 61 solar flares 60 Earth magnetosphere 60 Saturn rings 60 GRBs 60 merging galaxies 60 Jovian moons 60 Oort Cloud 60 Lyrids 60 Orionid 60 comet tail 60 NEAs 60 exosphere 60 interstellar clouds 60 ionized particles 60 Kuiper belt objects 60 Comet Tempel Tuttle 60 moonlets 60 accretion disks 59 asteroidal 59 X ray emission 59 gaseous planet 59 supernova explosion 59 galactic disk 59 Nasa spacecraft 59 transiting planets 59 protostars 59 comet Tempel Tuttle 59 collisional 59 RS Ophiuchi 59 galactic halo 59 alpha particles 59 circumstellar 59 silicates 59 silicate minerals 59 protoplanet 59 interstellar medium 59 chondrules 59 solar corona 58 Asteroid Belt 58 gamma rays 58 Saturn magnetosphere 58 pyroclastic flow 58 Saturnian moons 58 Upsilon Andromedae 58 interstellar dust grains 58 magnetars 58 interstellar particles 58 protoplanetary disks 58 Kuiper Belt Objects 58 lavas 58 photosphere 58 Solar flares 58 Valles Marineris 58 gaseous planets 58 silicon monoxide 58 stony meteorites 58 helium nuclei 58 interstellar dust 58 heavily cratered 58 AGNs 58 galaxy M# [002] 58 Upsilon Andromedae b 58 Earth ionosphere 58 ionized gas 58 cometary 58 micro meteorites 58 infalling 58 meteorite impacts 58 GJ#b 58 craters 57 extrasolar 57 silicate rocks 57 meteor impacts 57 coronal loops 57 jovian 57 X ray wavelengths 57 solar nebula 57 spherically symmetric 57 particles 57 Saturnian moon 57 retrograde orbit 57 coronal mass ejections 57 Samuel Oschin Telescope 57 Quadrantids 57 coronal holes 57 Gamma rays 57 Meteor showers 57 cometary dust 57 lunar crust 57 cosmic ray particles 57 planets orbits 57 novae 57 olivine mineral 57 Kuiper belt 57 Fomalhaut b 57 silicate dust 57 Orionids 57 dwarf galaxies 57 circumstellar disk 57 cosmic radiation 57 Taurids 57 elliptical orbits 57 infrared radiation 57 GJ #b [002] 57 heliosheath 57 Halley comet 57 accretion disk 57 Jupiter magnetosphere 57 gamma ray bursts 57 moonquakes 56 penumbral shadow 56 Swift Tuttle 56 galactic cosmic ray 56 proto planetary disk 56 Martian dust 56 spherules 56 galaxy M# [001] 56 dirty snowballs 56 meteoritic material 56 molten rocks 56 Oort cloud 56 galactic clusters 56 planetesimal 56 moonlet 56 Geminids 56 Galilean moons 56 periodic dimming 56 carbonate minerals 56 Kuiper belt object 56 cometary material 56 planet magnetosphere 56 Comet Hartley 2 56 planets 56 active galactic nuclei 56 explosive eruptions 56 luminous galaxies 56 supervolcanoes 56 X ray photons 56 hematite mineral 56 magnetotail 56 exoplanets orbiting 56 Neutron stars 56 circumstellar disks 56 gravitational interactions 56 Iapetus 56 gamma ray burst 56 diffract 56 comets orbiting 56 Jupiter Ganymede 56 planetary nebulae 56 neutron star 56 impactor 56 nebular 56 Tempel Tuttle 56 moons Phobos 56 proplyds 56 fainter objects 56 protoplanetary disk 56 elongated orbits 56 visible wavelengths 56 Alfven waves 56 sulfate aerosols 56 Comet Shoemaker Levy 56 inhabitable planets 56 Trojan asteroids 56 galaxies 56 planets asteroids 56 Jupiter moon Io 56 WASP #b 55 Earthlike planet 55 moon Mimas 55 dust devils 55 quasars 55 TGFs 55 Ulysses spacecraft 55 mineral olivine 55 P/# A2 55 ultraviolet wavelengths 55 Kuiper Belt objects 55 hydroxyl molecules 55 basaltic rocks 55 distant galaxy 55 interstellar grains 55 carbonaceous chondrite 55 Syrtis Major 55 globulars 55 Gamma ray bursts 55 AB Aurigae 55 planetary orbits 55 Beta Pictoris b 55 gamma rays emitted 55 magnetar 55 Pluto Charon 55 magnetospheric 55 comet Shoemaker Levy 55 Comet Halley 55 asteroid impacts 55 polar vortex 55 highly elliptical orbits 55 carbonaceous chondrites 55 Earthlike 55 RRATs 55 spiral galaxy NGC 55 relativistic particles 55 planetary embryos 55 comet orbit 55 particles WIMPs 55 rocky planets 55 airglow 55 Comet Lulin 55 Earth radii 55 lunar equator 55 extrasolar planetary systems 55 Galilean satellites 55 GALEX 55 BP Piscium 55 Leonids 55 Saturnian 55 helium atoms 55 supernova explosions 55 coronal loop 55 LCROSS spacecraft 54 stellar nurseries 54 filamentary structure 54 Apophis asteroid 54 nebulae 54 gravitational pulls 54 colliding asteroids 54 lava flows 54 Corot 7b 54 Quadrantid 54 exo planets 54 HM Cancri 54 X ray pulses 54 Mercury magnetosphere 54 sun corona 54 moons orbiting 54 X ray binaries 54 neutron stars 54 brown dwarfs 54 lensing galaxy 54 ejecta blanket 54 planetary surfaces 54 gravitationally 54 supernovae explosions 54 earthlike planets 54 Kuiper Belt object 54 hypervelocity 54 ionized gases 54 water vapor 54 V# Mon 54 comet dust 54 WIMPs 54 gravitationally bound 54 afterglows 54 permanently shadowed craters 54 cosmic cannibal 54 spacecraft flyby 54 globular clusters 54 CMEs 54 HiRISE images 54 Gravitational waves 54 olivine 54 dwarf galaxy 54 Deep Impact comet 54 moon Ganymede 54 meteorite 54 Galileo spacecraft 54 blazars 54 planemos 54 Aurigid 54 Omega Centauri 54 APXS 54 asteroid belt 54 gravitational waves 54 Geminid meteors 54 Arsia Mons 54 Cosmic ray 54 spacecraft 54 aerosol particles 54 Comet Tempel 1 54 Hot Jupiters 54 geostationary orbits 54 starburst galaxies 54 millisecond pulsar 54 Ring Nebula 54 gamma ray photons 54 silicate mantle 54 constellation Virgo 54 Comet Swift 54 proto galaxies 54 distant supernovae 54 CMB radiation 54 planet transits 54 mu Arae 54 relativistic jets 54 GJ #b [001] 54 Noctilucent clouds 54 Arches Cluster 54 Type Ia supernovas 54 particle acceleration 54 Comet Hartley 54 Globular clusters 54 magnetopause 54 cryovolcanism 54 galactic mergers 54 Milky Way Galaxy 54 synchrotron x ray 54 meteoroid impacts 54 HiRISE image 54 type Ia supernovae 54 Higgs bosons 54 erupt explosively 54 chromosphere 54 Virgo Cluster 54 Supernova #A 53 flood basalts 53 Martian atmosphere 53 magma molten rock 53 exoplanetary 53 galaxy clusters 53 cosmological distances 53 antimatter particles 53 Saturn moon Enceladus 53 interstellar dust particles 53 ionosphere 53 distant galaxies 53 Supernovae 53 Candor Chasma 53 OGLE TR #b 53 distant quasars 53 spherical particles 53 Tempel 1 53 photons 53 Toutatis 53 permanently shadowed 53 volcanic moon Io 53 IBEX spacecraft 53 unmanned probes 53 GRB #B 53 microquasar 53 orbits Saturn 53 circular orbits 53 Galactic cosmic rays 53 neutrons 53 interstellar space 53 lunar meteorites 53 infalling gas 53 regolith 53 noble gases 53 planets orbiting distant 53 millisecond pulsars 53 perihelion 53 Martian craters 53 optical telescopes 53 novas 53 muons 53 Muons 53 planet Nibiru 53 sodium atoms 53 planets orbiting stars 53 mineral hematite 53 planet HD #b 53 elliptical galaxy 53 Late Heavy Bombardment 53 circumstellar dust 53 aurorae 53 HiRISE camera aboard 53 interstellar dust clouds 53 quasar 53 outermost planets 53 X ray telescopes 53 #P/Churyumov-Gerasimenko 53 Eta Carinae 53 basaltic lava 53 molten magma 53 ionized atoms 53 ionise 53 inner moons 53 comet McNaught 53 outer corona 53 nucleosynthesis 53 Martian meteorites 53 brightest meteors 53 lunar craters 53 Beta Pictoris 53 HL Tau 53 protons 53 Comet Hale Bopp 53 metallicity 53 sized planets orbiting 53 nebulas 53 ionised 53 primitive meteorites 53 orbiting spacecraft 53 moon Enceladus 53 igneous rocks 53 phyllosilicate 53 heliospheric 53 RHESSI 53 meteor showers 53 magnetic substorms 53 albedo reflectivity 53 pulsars 53 astronomical objects 53 spiral nebulae 53 neutralinos 53 gravitational tugs 53 blazar 53 pyroxene 53 starquakes 53 dust particles 53 comet Swift 53 supernovas 53 emit X rays 53 supernova 53 Gliese #c 53 gamma ray emission 53 eclipsing binaries 53 transiting planet 53 Deep Impact craft 53 AU Mic 53 lunar soil 53 Halley Comet 53 Voyager spacecraft 53 energetic gamma rays 53 Microbursts 53 gravitational radiation 53 smallest exoplanet 53 orbital resonance 53 Crab Pulsar 53 Zeta Ophiuchi 53 hydrosphere 53 HD#b 53 trans Neptunian objects 53 orbits 53 celestial phenomena 52 occultations 52 Cabeus crater 52 Coronal Mass Ejections 52 CMB photons 52 blue supergiant 52 strangelets 52 hypernova 52 geomagnetic storms 52 plasmasphere 52 Earth asteroids NEAs 52 alpha particle 52 Itokawa 52 eccentric orbits 52 Geminga 52 Epsilon Aurigae 52 magmas 52 polarimetry 52 elliptical galaxies 52 BLG #Lb 52 Dwarf galaxies 52 radioactive decay 52 Comet 9P/Tempel 1 52 stellar occultation 52 galaxies collide 52 TrES 4 52 Leonid meteors 52 ionised gas 52 volcanic plumes 52 Milky Way halo 52 supernovae 52 Saturn moons 52 comet particles 52 sunlike star 52 radar interferometry 52 astrophysical objects 52 polar craters 52 extrasolar planets 52 protostar 52 orbital eccentricity 52 cosmic collisions 52 dimming starlight 52 Explosive eruptions 52 hot Jupiters 52 solar prominences 52 optical wavelengths 52 Dust devils 52 planetary nebulas 52 tidal tails 52 galaxy cluster 52 Trifid Nebula 52 electron neutrinos 52 terrestrial planets 52 gamma ray flashes 52 meteor shower 52 outer planets 52 plagioclase 52 blue straggler 52 orbiting planets 52 slender crescent 52 Cancri e 52 runaway thermonuclear 52 globular cluster 52 distant galaxy clusters 52 Antennae Galaxies 52 volcanic magma 52 backscattered 52 infall 52 Martian equator 52 Magellanic Clouds 52 SN #D 52 celestial bodies 52 Gemini constellation 52 substorms 52 Haumea 52 hydrated minerals 52 supermassive black hole 52 umbral shadow 52 crustal rocks 52 constellation Carina 52 GQ Lupi 52 Comet Holmes 52 Enceladus 52 electrons protons 52 Wolf Rayet stars 52 gravitons 52 Fermi telescope 52 gravitational perturbations 52 constellation Aquarius 52 Type Ia supernova 52 spheroidal 52 magnetic reconnection 52 lightwaves 52 red supergiants 52 SN #gy 52 Perseid meteors 52 tidally 52 planet WASP #b 52 ionize 52 planetary nebula 52 sunspots 52 Asteroids 52 gravitational tides 52 supernova remnants 52 Earth orbiting satellites 52 heliosphere 52 HD #b [002] 52 prominences 52 cometary impacts 52 gamma ray bursts GRBs 52 X ray observatories 52 constellation Lyra 52 basaltic 52 Pyroclastic flows 52 Sagittarius dwarf galaxy 52 synchronous orbit 52 lava tubes 52 tiny meteoroids 52 subatomic particles 52 X ray binary 52 coronagraph 52 substorm 52 reflection nebula 52 Super Earths 52 energetic cosmic rays 52 hadrons 52 hydrothermal explosions 52 polar latitudes 52 axions 52 antiprotons 52 CoRoT satellite 52 magnetic excitations 52 lithosphere 52 red supergiant 52 interstellar cloud 52 submillimeter galaxies 52 tau neutrinos 52 neutron radiation 52 planetoids 52 QQ# 52 CoRoT #b 52 astronomers 52 exoplanets 52 magma ocean 52 TNOs 51 CoRoT 7b 51 Saturn moon Iapetus 51 noctilucent clouds 51 SN #A 51 exosolar planets 51 electrons positrons 51 lunar crater 51 baryon 51 MG J# +# 51 magnetospheres 51 Delta Aquarids 51 atomic nuclei 51 spherical halo 51 ballistic trajectory 51 Saturn outermost 51 spatially resolved 51 supergiant stars 51 habitable planets 51 supergiant star 51 oppositely directed 51 Coronal mass 51 highly elliptical orbit 51 geomagnetic field 51 Kuiper Belt Object 51 deuterium atoms 51 atmospheric aerosols 51 silicate grains 51 volcanic plume 51 super Earths 51 interstellar distances 51 Helix Nebula 51 Perseids 51 Hanny Voorwerp 51 neutrino 51 NFIRE satellite 51 atomic particles 51 gravitational redshift 51 excitons 51 Wolf Rayet star 51 Eta Aquarids 51 type Ia supernova 51 aboard ESA Envisat 51 gravitational interaction 51 supernova remnant 51 VY Canis Majoris 51 lunar perigee 51 Olympus Mons 51 planet Uranus 51 Apophis 51 cosmic phenomena 51 SMBH 51 deep convective clouds 51 eclipsing binary 51 asteroids orbiting 51 binary asteroid 51 martian rocks 51 solar neutrinos 51 orbiter 51 distant supernovas 51 superposed 51 infrared telescopes 51 spiral galaxies 51 Churyumov Gerasimenko 51 UV photons 51 volcanic 51 cosmic ray collisions 51 igneous rock 51 Scheila 51 Gamma ray 51 Orion Nebula 51 Taurid 51 atmospheric disturbances 51 basalts 51 cosmic microwave radiation 51 gamma ray observatory 51 Neptune Uranus 51 Cassini flybys 51 rotational axis 51 tholins 51 Cassini flyby 51 heliopause 51 Murchison meteorite 51 Bok globules 51 Terra Sirenum 51 auroral displays 51 planets comets 51 Io volcanoes 51 basaltic magma 51 Earth asteroids 51 comets meteors 51 Type Ia 51 Gamma ray burst 51 ULIRGs 51 pyroclastic 51 antiparticles 51 bolide 51 extrasolar planet 51 pions 51 interstellar boundary 51 Saturn moon 51 shadowed craters 51 chondritic meteorites 51 Bullet Cluster 51 spectroscopic analysis 51 magnetic monopoles 51 Spiral galaxies 51 polar caps 51 Corot 9b 51 intrinsic brightness 51 Manned missions 51 Andromeda Galaxy 51 Meteorites 51 chondrites 51 waning gibbous 51 lapilli 51 Saturn Cassini 51 Earthlike planets 51 icy crust 51 micrometeoroid impacts 51 supermassive 51 accreting 51 galactic cores 51 redshifted 51 mesosphere 51 emission nebula 51 spacetime 51 Magnetars 51 jarosite 51 faint meteors 51 Crab Nebula 51 Meteor Crater 51 proto planetary disks 51 diffuse aurora 51 jet contrails 51 planetary atmospheres 51 cometary particles 51 neutrinos 51 galactic cosmic radiation 51 antineutrinos 51 star Gliese 51 Kuiper Belt 51 electromagnetic flux 51 Quadrantid meteor shower 51 Saturn Enceladus 51 planet Gliese #c 51 atmospheric turbulence 51 particles emitted 51 Meridiani 51 stellar occultations 51 sterile neutrino 51 permanently shadowed regions 51 constellation Taurus 51 Ultraviolet rays 51 compressional 51 Type 1a supernova 50 sterile neutrinos 50 hydrogen helium 50 distant quasar 50 Mojzsis 50 Andromeda galaxy 50 binary asteroids 50 presolar grains 50 mid latitudes 50 Yellowstone Caldera 50 microlensing events 50 satellites orbiting Earth 50 Coma Cluster 50 thermonuclear reactions 50 moon Phobos 50 anorthosite 50 Earthly contamination 50 Martian polar 50 photochemical reactions 50 unconsolidated sediments 50 Photons 50 icy moon Enceladus 50 Saturn moon Mimas 50 retrograde orbits 50 pegmatitic 50 orbital velocity 50 sulfate aerosol 50 hypervelocity stars 50 auroral oval 50 emits X rays 50 planets atmospheres 50 galaxy 50 Cat Paw Nebula 50 GRB # 50 NASA Stardust spacecraft 50 Phaethon 50 sundog 50 spectral fingerprints 50 relativistic protons 50 neutrino particles 50 interplanetary dust 50 radioactive nuclei 50 baryonic 50 cumulus cloud 50 Geminid 50 detect gamma rays 50 meteorite bombardment 50 Shackleton crater 50 crystalline silicates 50 CAIs 50 x ray beams 50 BP Psc 50 ENAs 50 comet Tempel 1 50 Imaging Spectroradiometer MODIS instrument 50 interplanetary spacecraft 50 Nibiru 50 XMM Newton satellite 50 Comet Encke 50 Solar System 50 volcanism 50 NASA Voyager spacecraft 50 graphite whiskers 50 outer layers 50 colliding galaxies 50 constellation Centaurus 50 planet orbiting 50 supersymmetric particles 50 dense clumps 50 Carina constellation 50 constellation Perseus 50 HIRES spectrometer 50 SN#A 50 subduction zones 50 hypersonic speeds 50 molten droplets 50 geosynchronous satellites 50 terahertz waves 50 high redshift galaxies 50 Tunguska object 50 impactor spacecraft 50 Stephan Quintet 50 rubidium vapor 50 Planetary nebulae 50 auroral activity 50 Henize #-# 50 giant gaseous planets 50 radial velocity method 50 helium atom 50 convective 50 planet Gliese #g 50 Cabeus 50 Saharan Desert 50 particle beams 50 inner Oort Cloud 50 Encke gap 50 Cassini 50 Neutrinos 50 ESO PR 50 Cumbre Vieja 50 toxic hydrazine 50 hydrothermal fluid 50 Saturn auroras 50 lava fountains 50 Dumbbell Nebula 50 CoRoT 9b 50 submillimeter 50 lanthanides 50 Kepler #b 50 positronium atoms 50 Brownian particles 50 HIP #b 50 galaxy NGC 50 transiting exoplanets 50 exoplanet 50 orbiting Cassini spacecraft 50 moons 50 ecliptic plane 50 protoplanetary discs 50 planets Uranus 50 Elenin 50 Martian rovers 50 Cherenkov radiation 50 Astrological lore 50 infrared spectra 50 olivines 50 Saturnian moon Titan 50 shorter wavelengths 50 rotating neutron stars 50 XTE J# 50 Exoplanet 50 Small Magellanic Cloud 50 WD5 50 Deep Impact probe 50 cosmic ray flux 50 sun ultraviolet radiation 50 Aram Chaos 50 superheated gases 50 carbonatites 50 Earth 50 lahars 50 Triangulum Galaxy 50 THEMIS Image 50 Jovian moon 50 celestial object 50 corona 50 exoplanets planets 50 Galaxy Evolution 49 protoplanetary 49 Stardust spacecraft 49 waxing crescent 49 Gliese #g 49 Gusev crater 49 orbiting satellites 49 Microlensing 49 laser pulses 49 shepherding spacecraft 49 mantle plumes 49 sunspot 49 muon neutrinos 49 grabens 49 infrared spectrometers 49 constellation Hercules 49 SNR #-#.# 49 wispy cirrus clouds 49 Martian terrain 49 lunar regolith 49 Red Rectangle 49 planet orbits 49 hydrogen atoms 49 galaxy formation 49 planets orbiting sun 49 protons collide 49 quantum tunneling 49 YU# 49 Io Europa 49 Taurid meteor shower 49 geoeffective 49 active galactic nucleus 49 nuclei 49 infrared wavelengths 49 COROT 49 tectonic activity 49 YORP effect 49 spectral fingerprint 49 galactic bulge 49 particle 49 yardangs 49 NASA Gamma ray 49 COROT exo 3b 49 NASA Wilkinson Microwave 49 observable universe 49 incandescent lava 49 electron beams 49 pyroclastic flows 49 gravitational lens 49 Reiner Gamma 49 Martian crater 49 Terra Meridiani 49 baryonic matter 49 volcanic eruptions 49 Jupiter icy moons 49 TW Hydrae 49 Distant galaxies 49 Chicxulub 49 ionized molecules 49 HII regions 49 whiz harmlessly 49 moon Charon 49 tropical latitudes 49 KH #D 49 asteroid collisions 49 Hubble orbits 49 molten rock 49 Particles 49 Tharsis Rise 49 olivine crystals 49 gravity warps 49 detect gravitational waves 49 calderas 49 Mars landers 49 Veil Nebula 49 planetoid 49 longwave radiation 49 magnetic fields 49 sedimentary deposits 49 cirrus clouds 49 solitons 49 millimeter wavelength 49 NEOs